Improvement in filters



G. CURTIS.

FILTER.

No. 109,593. Patented Nov. 29, 1870.

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GEORGE CURTIS, OF SPRINGFIELD, MASSACHUSETTS, ASSIGNOB' TO HIM SELF AND EDMUND BIGELOW, OF SAME PLACE.

LettersPetent No. 109.593. dated November 29, 1870.

IMPROVEMENT lN FlLTER S.

The schedule referred to in these Letters Patent and making part of the same.

To an whom it may concern:

Be it known that I, GEORGE Oumusfof Springfield, Hampdcn county, Commonwealth of Massachusetts, have invented certain new and useful Improvements in Filters; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being bad to the accompanying drawing making part of this specification, in which Figure 1 shows a section of my improved filter;

Eigure 2, a plan view of the same, with the upper sponge and detlector removed;

Figure 3, a plan view of the deflector;

Figure 4, the lower sponge-case;

Figure 5, thenpper sieve;

Figure 6, the ring for holdingthe same in place; and

Figure 7 is a sectional .vicw of the tub to which the filter is attached.

My said invention rclatesto the filter described inmy application for patent now pending in the Patent (mice, and consists of new arrangements of the parts and additional devices, to adapt the invention therein shown to the use of paper manufacturers and others requiring large filters.

The tub, shown in fig. '7, is of the ordinary construction used in paper-mills, and provided with pipes, 'A and B, so that two or more kinds of water can be introduced between the bottom a of the tub and the false bottom I).

To the false bottom b the litter is attached, so that the water flows upward though it and into the tub.

The construction of my improved filter 1 will now describe.

G is the flange, by which it is attached to the false bottom I) of the tub.

Dis the surrounding case, which contains within itslower part the sponge 1' arranged inside of acasc, F, which is of a considerably less diameter than the outside case 1), and titted to a tube, G, extending u from the bottom, and leaving an annular receptacle, H, between the tube G and the surroumling case 1), for the collection of the impurities that pass through the first sponge, F.

Above this sponge E, in the upper-part of the case, I arrange the compressed sponge K, held between the deflecting-case L and the sierelll, similar in arrangement to my previously-mentioncd filter described in my pending application.

These parts are secured within the case 1) by the ring 0, which screws on the outside of the case D, or may be fastened by pins and slots or similar devices. The inner surface of the deflector is provided with a projecting tianch or rim, 5, which I prefer to incline downward, the other: of which is to prevent the water from passing upward between the inner surface of the deflector and the sponge K.

The object attained by the use of the additional sponge is that coarse matter, such as gravel, sticks, and straws, and other coarse impurities, are stopped by this sponge, and the water is presented to-the'sec- 0nd sponge in a comparatively clean state, the recess H assisting the filtration by collecting such coarse matter-as may pass tbroughthe first sponge.

By combining a. first sponge with the second, with the deflector interposed, I avoid the action of a strong current through the second sponge, and thus cause the water to rise gradually and steadily in the filtercase and to pass evenly through the upper 'or second sponge.

- In order to enlarge the capacity of my filter I often arrange two or more sponges, K, and accompanying devices, in connection with a single sponge,

What I claim as my invention, and desire to'secnre by Letterslatent, is-

1. The combination, in filters to be used in purifying water under a head or pressure, of the two sponges E and K, so arranged as'to present to the water successive filtering media of unequal density, with the interposed defleotor'and the tianch or rim S, projecting inward from the inner surface of the deflector, substantially as and for the purpose set forth.

2. The combination, in filters for purifying water under a head or prossnrc,'of the sponges E and K,'sc arranged as to present to the-water successive filteror rim-S, the surrounding case 1*, the space H, and thesnrronndlng box '1), and the false bottom, substantially as and for the purposes set forth.

3. The combination, in filters for purifying water under a pressure or head, of a sponge, 11,21. deflector, and a'rim or flanch, S, substantially as and for. the

purpose set forth.

GEORGE CURTIS.

Witnesses:

J. B. GARDINER, D. M. Worms..

mg, media of unequal density, the deflector, the flanclr 

